Fan



FIG. 1 is an isometric view taken from the front, top and left end of a fan embodying my new design;

FIG. 2 is a right end elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a left end elevational view thereof. 

The ornamental design for a fan, substantially as shown and described. 